Improvement in regenerator-furnaces



2 Sheets--Sheet 1.

H. FRANK.

Regenerator-Furnaces.

No, 135,640, PafentedFeb.u,1a73.

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Begenerato-Furnaes. No. 135,640. Paremedfeb-1m873.

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HIMAN FRANK, OF PITTSBURG, PENNSYLVANIA.

IMPROVEMENT |N REeENERAToR-FURNACES.

Specification forming part of Letters Patent No. 135,640, dated February l1, 1873.

To all whom t may concern: Beit known that I, HIMAN FRANK, of Pittsburg, inthe county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Hot-Blast Furnace; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawing forming a part of this specilication, in Which- Figure l is a vertical cross-section of my improved hotblast through the line a.' x, Fig. 3; Fig. 2 is a vertical longitudinal section through y y, Fig. 3; Fig. 3 is a horizontal sectionV through z'z, Fig. 2, and Fig. 4 is a front elevation of the same.

Like letters of reference indicate like parts in each.`

My invention consists in the construction of a hot-blast furnace, of bricks or tile, having both vertical and transverse openings or passages, so arranged that the hot gases or products of combustion from the combustion-chamber shall be caused to pass in one direction through one set of passages, and the air to be heated, entering at a point distant from the combustion-chamber, is caused to pass through the other set of passages in a transverse direction to the place of exit-a point at or near the combustion-chamber-in its passage having traversed the walls and chambers heated by the current of hot gases from the combustionchamber. It will therefore be seen that the cold air, entering at a point nearest to the stack or place of exit of the heated products of combustion, and proceeding from thence toward the combustion-chamber, is constantly rising in temperature by means of the accretions of heat taken up in its progress through walls of successively-increased temperature, and that the products of `combustion from the combustionchamber, meeting, in their passage to the stack, a current of air of decreasing temperature, gradually lose their heat until they have parted with a maximum quantity. Thus a large quantity of heat otherwise waste77 is utilized for this purpose.

To enable others skilled in the art to construct and use my invention, I will describe it lmore specifically.

or passages a a, andv transverse ues cr passages b b. In the lower part of one side or section, D, of the furnace is the combustionchamber c, from which the flue leads back the entire length of the furnace, and above which is a series of walls,A; and chambers B are constructed throughout the length ofthe furnace. The passages a. lead from the combustion chamber c up to the arched roof d, which forms a chamber, e, which extends across the center wall C over both sections D and E of the fur nace. The two sides D and E of the furnace are constructed alike. down from the chamber c to the iiue j,which leads by the opening i to the stack. The chan1 bers B are closed at the top and bottom, but are in communication with each other bymeans of the passages b. Air is admitted to the furnace through the openin g g, which is designed to be controlled by suitable dampers, and passes out at the exit h, from whence it is conducted to any desired point by suitable dues or conductors.

The operation is as follows: rlhe heated prod ucts of combustion from the chamber c pass up through the passages a to the chamber e;

chamber B, passes directly back through the Walls A A, by means of the passages b, to the last chamber B, by means of which it crosses to the other section D, and passes forward, by the passages, b, to the front chamber B, and from thence through the exit h. The heat which is acquired by the Walls A from the heated products of combustion is transmitted through them and given oif to the inilowing current of cold air, which is thereby heated.

In hot-blasts used in connection with blastfurnaces the vertical flues are liable to become clogged with deposits from lime, &c., which must be removed by mechanical means. In order to accomplish this I make an opening, n, in the roof, closed by a plug, above each ilue. By means of a brush inserted through this opening the flue may be cleaned of all dea posits.

Ths passages a lead` By this construction I secure a very superior furnace, cheap of construction, and thorough and simple in operation. The bricks of which the Walls A are built should be made large, so that but few would be required in constructing the Walls, as thereby a multiplicity of joints is avoided, which is a desideratum, as the joints are liable to leak and permit the intermiXture of the air and gas. Each wall may be made in one piece, and thereby entirely avoid joints.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. The Walls A, constructed,as described, with vertical passages a and transverse passages b, such passages being made through the brick or tile which compose the walls.

2. The heating-chamber constructed with alternate walls A and chambers B, the former l HIMAN FRANK.

Witnesses:

A. S. NICHOLSON, THos. B. KERR. 

